MPA4609IPFBR

Overview

The MPA4609IPFBR is a quad, differential I/O, 2x1 multiplexed high gain preamplifier manufactured by Texas Instruments. It features four differential output channels and two sets of four differential inputs controlled by TTL/CMOS channel select lines. The device operates on a single +5V supply with a quiescent current of 50mA. It provides a nominal open-load gain of 190V/V and a bandwidth of 90MHz up to a 3.5Vpp output. Key electrical characteristics include a low input noise voltage of 0.65nV/√Hz, a differential slew rate of 150V/µs, and an operating temperature range from -40°C to +85°C.

Feature Summary

• Integrates eight differential low-noise voltage preamps arranged in two selectable sets of four channels.
• Features internal biasing that maintains differential inputs at 2.0V and outputs at a 2.1V common-mode level.
• Includes series 470Ω resistors in each output leg to provide a nominal output impedance and allow gain adjustment via external loading.
• Utilizes fast channel switching logic compatible with standard TTL or CMOS control signals.

Applications

• Tape preamplifiers for selecting forward and reverse heads
• Multi-channel twisted pair receivers
• High gain quad ADC drivers
• Ultra sound pre-amplifiers

Procurement Notes

Verify the package designator PFB corresponds to the TQFP-48 form factor required for your PCB layout. Confirm the suffix BR indicates the tape and reel packaging format with a quantity of 2000 units. Ensure the operating temperature grade supports environments ranging from -40°C to +85°C. Cross-reference the ordering number MPA4609IPFBR against the latest manufacturer documentation to validate current production status and availability.

Selection Notes

Select this component when a fixed high gain of approximately 190V/V is required for differential signal conditioning. It is suitable for applications demanding low input noise voltage below 1nV/√Hz and wide bandwidth exceeding 90MHz. The device is appropriate for systems requiring multiplexing between two input sources using simple digital control lines. Consider its single +5V supply operation and low quiescent current for power-constrained multi-channel designs.

Part Context

The MPA4609 belongs to a family of fixed-gain differential amplifiers designed for low-level signal amplification. It integrates multiple amplifier stages into a single chip to reduce board space and component count. The device is optimized for high-speed data acquisition and audio processing applications where maintaining signal integrity across multiple channels is critical.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How is the channel selection implemented?

Channel selection is managed by two TTL/CMOS compatible pins (Pin 3 and Pin 34). A voltage below 0.9V selects the reverse channels, while a voltage above 1.6V selects the forward channels.

What is the maximum differential output swing?

The maximum no-load differential output swing is 3.5Vpp, centered on the 2.1V internal bias level.

How can the gain be attenuated?

The nominal gain of 190V/V can be reduced by adding an external load resistor between the differential output pins. For example, a 940Ω resistor reduces the gain by half to 95V/V.